The switch is just a dual bios feature, all of the cards have them. Only the cards with the reference PCB (hence the AMD logo) have the change to unlock. The cards that you listed, use non-reference PCBs, therefore, will not unlock.

The switch is just a dual bios feature, all of the cards have them. Only the cards with the reference PCB (hence the AMD logo) have the change to unlock. The cards that you listed, use non-reference PCBs, therefore, will not unlock.